Those numbers are interesting, I have seen them before.

Deer are now more plentiful, and in concentrated areas.

As far as technology advancements go...I don`t think that has made it any easier to harvest deer.

I mean, you can shoot a longbow as accurately as a new bowtech right?
You can hold a longbow at fulldraw as long as a new 80% letoff bow.

OK, I`m done being a wiseguy. I think a number of factors are responsible for increased success rates of archers. Not the least of which is due to technological advancements in equipment.